# Phase and group velocity of a soliton? [closed]

How do I find the phase velocity and group velocity of a soliton with a $\operatorname{sech}$ (hyperbolic secant) envelope?

## closed as off-topic by John Rennie, JamalS, ACuriousMind♦, Neuneck, Kyle KanosNov 14 '14 at 14:41

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